How to check textiles for daylight fading
Define where the textile will be used, select representative production colours and agree the laboratory method and acceptance limit before testing. Compare exposed specimens with matching material kept away from light, and record each colour separately. Cambridge China Bridge can coordinate samples with its staff in China.
Describe the intended daylight exposure
Tell the laboratory whether the textile is for curtains behind glass, indoor upholstery near a window, clothing or outdoor use. Describe the exposed face, likely shading and whether heat, rain or cleaning will accompany exposure. Ask the laboratory to explain how its proposed conditions relate to that use.
Treat a windowsill trial as an observation rather than your sole acceptance test. Record its location, glazing and exposure conditions, and keep matching unexposed material. Do not turn the trial or a laboratory result into a promised service life without supporting evidence.
Choose colours and material that represent the order
Prepare a colour and material list covering the ordered fabrics, prints, finishes and dye batches. Ask the laboratory which variants need separate testing and why any proposed representative colour can cover others. Include visibly important print colours and contrasting trims; do not let the factory choose only its preferred sample.
Take samples from the material intended for production and identify the fabric, colour, batch and finish. Keep a matching unexposed portion from the same material. Use the guides on report coverage across colours and laboratory sample chain of custody for those supporting checks.
Agree the laboratory brief before testing
Ask the laboratory to propose a named light-fastness method, its edition and the procedure suited to your exposure brief. Discuss whether an artificial-light xenon-arc test is appropriate. Have the laboratory state the filters, exposure endpoint, temperature and humidity conditions, reference materials and assessment scale in its proposal.
Agree the acceptance limit for each colour and how the laboratory will report colour change against matching unexposed material. Specify whether assessment is visual, instrumental or both, and how borderline results will be handled. Keep cleaning performance in a separate brief using textile wash-performance approval.
Compare with retained unexposed material
Label the retained material and store it away from light, moisture and contamination. Ask the laboratory to preserve an unexposed comparison area or matching specimen under its agreed procedure. Compare like with like: the same fabric face, finish and print area, viewed under consistent assessment conditions.
Request results for each tested colour, specimen identification, actual conditions and any departures from the agreed method. Use photographs to locate changes, but base acceptance on the agreed assessment rather than screen images. Check whether fading changes the balance of a print or creates a mismatch between fabric and trim.
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Make approval traceable to production
Record approval against the tested material and agreed limits. If a colour fails, ask the factory to propose a dye or finish change, then test the revised material before approving it. Agree that later changes to dyes, fabric or finishing trigger a review of whether the fading evidence still applies.
Keep the report, sample identities, retained material and approval decision together. Give the factory a written list of approved combinations and unresolved colours. Cambridge China Bridge's staff in China can coordinate sample collection and factory follow-up against that brief.
Frequently asked questions
Can I check fabric fading on a windowsill?
Use it as a recorded practical trial with matching unexposed material. For order acceptance, agree a laboratory method and limit because glazing, shading and exposure conditions can vary.
Does a wash-fastness result prove daylight resistance?
Ask for a separate light-fastness assessment. Keep washing and daylight exposure as distinct checks, with their own methods and acceptance decisions.
Do all textile colours need fading tests?
Give the laboratory the full colour and material list. Agree which variants need testing and record the reason for any grouping; do not assume a result covers untested colours.
What should I keep for comparison after a fading test?
Keep labelled, matching unexposed material from the tested batch, protected from light and contamination, alongside the report and approval record.